The chap on the far Left, possibly a Warrant Officer with his Sam Browne, is wearing the British War Medal and Victory Medal for service in the Great War so the photo must date to after 1918. Considering that many medals weren't issued until well into the 1920's then this may push forward the probable date even further.

Another chap, beside him, seems to be wearing just his Great War ribbons so perhaps he's still awaiting his issue? I believe that the BWM and VM didn't start being issued until 1921-22 so this might be a good starting point? I can't positively identify all the ribbons worn but at least two soldiers have a 1914 Star or a 1914-15 Star at the beginning of their ribbon bar.

Cheers,

Mark

ps: Just noticed that another chap seems to be wearing a Sam Browne, or at least something similar. Hmmm?

The East Ridings adopted a Tank Corps style beret and distinctive arm badge in 1924, so if Mark is correct in dating the issue of the World War medals to 1921-2 then the photograph must date to 1921-1923. Trooper